Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1
The P20E2 code indicates a correlation issue between exhaust gas temperature (EGT) sensors 1 and 2 on Bank 1. These sensors monitor exhaust temperature for diesel particulate filter (DPF) regeneration and engine protection. When their readings diverge beyond a calibrated threshold, the PCM sets this code, often due to sensor failure, wiring problems, or exhaust leaks.
1. Most Common Causes
- Faulty EGT sensor 1 or 2
- Wiring or connector issues (corrosion, damage)
- Exhaust leak near sensors
- PCM software or calibration error
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced fuel economy
- Possible DPF regeneration issues
- Engine may enter limp mode
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect EGT sensors and wiring for damage or corrosion.
Step 3: Compare live data from both sensors; look for significant deviation.
Step 4: Check for exhaust leaks upstream of sensors.
Step 5: Test sensor resistance and voltage per manufacturer specs.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to DPF damage or engine performance issues. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and sensor replacement, but costs can vary if wiring repairs or PCM updates are needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.